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cc1: Expect semicolon after do-while

--- a/src/cmd/cc/cc1/stmt.c

+++ b/src/cmd/cc/cc1/stmt.c

@@ -156,9 +156,12 @@

 	emit(OBLOOP, NULL);

 	emit(OLABEL, begin);

+

 	stmt(lbreak, lcont, lswitch);

 	expect(WHILE);

 	np = condition(NONEGATE);

+	expect(';');

+

 	emit(OLABEL, lcont);

 	emit(OBRANCH, begin);

 	emit(OEXPR, np);